Ok I was told there are 4:11 gears in my 8.8 and I feel like it's too much gear. Especially when cruising on the freeway, somewhere around 3000 rpm at 60 mph. Going down to a 3:73 or 3:55 what would my rpm be at 60 mph
Ok I was told there are 4:11 gears in my 8.8 and I feel like it's too much gear. Especially when cruising on the freeway, somewhere around 3000 rpm at 60 mph. Going down to a 3:73 or 3:55 what would my rpm be at 60 mph
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___________Rob L.___________
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Last edited by Irish; 12-31-2009 at 12:23 PM.
It is simple linear math based on the known rpm/gear you have now.
3.73s:
3.73/4.11 * 3000 = ~2722 rpm at 60
3.55s:
3.55/4.11 * 3000 = ~2591 rpm at 60
Awesome thanks guys probably going with 3:55's in the spring. I want to take this car on longer drives when it gets nice out again.
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___________Rob L.___________
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Last edited by Irish; 12-31-2009 at 12:23 PM.
I love my 3.73's. Difference between 3.73 and 3.55s is only 200 rpms.
hmmm and with my aod I want 4.10s but maybe 3.73s would be ok
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Red 1982 Trans Am MSE Hooker 1 5/8, 3 inches back, 3:73s ---- Red 1990 Formula with ZZ4 motor, Hooker 2055s, American Thunder catback ---- Black 1991 GTA with 3 inch Flowmaster Catback system ---- Black 2002 WS6 Bone Stock
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You use the gear that is closest to a 1:1 ratio, similar to a dyno run.
Either way, it's based off this equation.
(MPH x Transmission Gear x Rear Gear x 336) / Tire Diameter(inches) = RPM
Last edited by TransAm12sec; 11-05-2009 at 09:55 AM.
Those look like a 28 tire on your car in the sig. I would do a 3.73 theres a reason that they sell so many, plus you would have stoplight capabilities and hwy miles.
I had a 347 E cammed 5 speed car with 4.10 and a 26'' and I got 22 MPG's. Looking back 3.73's is what everybody told me and I should of did.
GL though whatever ya choose.
If a hammer,crescent wrench,duct tape, or JB Weld can't fix it........Its gotta be a electrical problem
tire size and trans ratio make a huge difference also.for instance on my 18's with the trans i have and 4.10's it is at 3000rpms at 84 mph
special thanks to: Marv @ C&M performance 262-993-6605
What trans do you have? my 95 with a 28" tall tire and 3.73's were perfact for the freeway, but I had a T5 wich was a .68 5th gear. But since you have a 4 eyed, you could have any trans in that year range which would be either a .68 .63 or .80 ratio.... I dont know what the autos had for a high gear, but im guessing you have a t5. I cant remember what my rpm was, but I know i averaged 20 MPG on the freeway and it wasn't winding up high at all.
70 cutlass 442- dads car
95 stang- Stock long block 195,XXX miles
03 XC600 - bone stock (still faster then smokin ram)
03 Polaris predator- 4.250 bore (assembly required)
84- 4 eyed
yeah it's a 28" tire with a C4 trans
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___________Rob L.___________
Thats your problem, you have no overdrive. Better get used to it, swapping to a 3.55 with that tall tire is gonna make the car feel like a turd.
70 cutlass 442- dads car
95 stang- Stock long block 195,XXX miles
03 XC600 - bone stock (still faster then smokin ram)
03 Polaris predator- 4.250 bore (assembly required)
84- 4 eyed
Here is one I downloaded and then modified for my car. I have a 5-spd 2006 with 3.73 gears. I have 27" tires (255/45/R18). If it works for you with little modification great. If not, PM me and I will work out the details and send it to you.
Last edited by 1320PNY; 09-10-2010 at 04:05 PM.
I have a 9.5" converter 3000 stall
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___________Rob L.___________
Like I said, it will be a pooch. You have to decide whats important to you, going quick from a stop or nice highway cruising. You are not going to get both with your current setup.
70 cutlass 442- dads car
95 stang- Stock long block 195,XXX miles
03 XC600 - bone stock (still faster then smokin ram)
03 Polaris predator- 4.250 bore (assembly required)
84- 4 eyed